204 



Fig. 198. BOUTELOUA HAVARDI Vasev in .'-;. Wats. Proc. Am. Acad. 

 18: 179. 1883. HA YARD'S GRAMA.— A perennial, ^vith .strong rhizomes, 

 upright culms 2-4 dm. (8'-16') high, and four to six short, silky-villous spikes 

 (a), approximate on the common rachis. Sheaths short, loose, .striate, the 

 upper ones longer: leaf-blades concave, rigid, the lower ones crowded, scabrous 

 on the margins and beneath, ciliate with short, scattered hairs. Spikelets 6 

 mm. (3" j long, pubescent throughout; second empty glume (b) three times as 

 long as the first; flowering glumes (c,dj, 3-toothed,awnless or short awned; 

 awns of rudiment (e) .5-10 mm. (2i"-.5"i mm. long, the middle one wing-mar- 

 gined.— Sandy plains, rocky hills, canyons, about springs, etc., Texas to Arizona. 

 (Northern Mexico.) April to September. 



